**Core Concept**
The disposal of noninfectious waste in hospitals requires the use of color-coded plastic bags to facilitate segregation and reduce the risk of cross-contamination. This practice is in line with the principles of infection control and waste management.

**Why the Correct Answer is Right**
Noninfectious waste, also known as non-hazardous or non-infectious medical waste, typically includes items such as plastic disposables, paper products, and glassware. These items do not pose a risk of infection or harm to healthcare workers. The use of yellow plastic bags is specifically designated for noninfectious waste, as it helps to identify and separate these items from infectious waste, which is disposed of in red bags.

**Why Each Wrong Option is Incorrect**
* **Option A:** Blue plastic bags are used for sharps and recyclable materials, making it an incorrect choice for noninfectious waste.
* **Option B:** Black plastic bags are used for anatomical waste, such as human remains, and are not suitable for noninfectious waste.
* **Option C:** Red plastic bags are designated for infectious waste, which poses a risk of infection or harm to healthcare workers.

**Clinical Pearl / High-Yield Fact**
It is essential to follow the color-coding system for waste disposal in hospitals to prevent cross-contamination and maintain a safe working environment. This includes using yellow bags for noninfectious waste, red bags for infectious waste, and blue bags for sharps and recyclable materials.

**Correct Answer: C. Red plastic bags are designated for infectious waste.